Breach of contract

I have made an arrangement for payment of my rcp for end of month - which has been paid without fail and on time every month. End of November the deduction was made, with another showing up today(15th) without prior arrangement. After waiting a long time for a consultant, the answer was - a lot of companies pay their employees today and several pay bonusses. With no regard or consultation that I am getting paid neither at this date. So then after a long series of pointless “security questions” , the story changed to - all of our clients were notified during contract signature that the deduction would be made at this date during December. Which is bull, because neither of the previous two years did this. So finally he gets to the reversal of the amount then I get a - sorry, it does not show up yet, try again tomorrow. Thank you standard bank for RUINING any hopes I had at having a little bit of a holiday with this utterly disgusting assumption. I am severely disappointed with the manner in which you conduct business.